Chemical Thermodynamics Question 247

Question: The values of heat of formation of $ SO_2 $ and $ SO_3 $ are $ -298.2,kJ $ and $ -98.2,kJ $ . The heat of reaction of the following reaction will be $ SO_2+\frac{1}{2}O_2\to SO_3 $ [BHU 1997; CBSE PMT 2000]

Options:

A) $ -200,kJ $

B) $ -356.2,kJ $

C) $ +200,kJ $

D) $ -396.2,kJ $

Show Answer

Answer:

Correct Answer: C

Solution:

$ S+O_2\to SO_2,\Delta H=-298.2kJ $ -.(i) $ SO_2+\frac{1}{2}O_2\to SO_3,\Delta H=-98.2kJ $ -.(ii) eq. (i) - (ii) and find the required result.



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